[turbofan] Turn Math.clz32 into an inlinable builtin.

src/compiler/arm/instruction-selector-arm.cc

Index: src/compiler/arm/instruction-selector-arm.cc
diff --git a/src/compiler/arm/instruction-selector-arm.cc b/src/compiler/arm/instruction-selector-arm.cc
index 20276ede7e62364fb5c4f6bff3f6780007224f32..9f788a5bfa8be5d3c359ff67d0e718aedb4d03ea 100644
--- a/src/compiler/arm/instruction-selector-arm.cc
+++ b/src/compiler/arm/instruction-selector-arm.cc
@@ -645,6 +645,12 @@ void InstructionSelector::VisitWord32Ror(Node* node) {
 }
 
 
+void InstructionSelector::VisitWord32Clz(Node* node) {
+  ArmOperandGenerator g(this);
+  Emit(kArmClz, g.DefineAsRegister(node), g.UseRegister(node->InputAt(0)));
+}
+
+
 void InstructionSelector::VisitInt32Add(Node* node) {
   ArmOperandGenerator g(this);
   Int32BinopMatcher m(node);